RITUXIMAB DOSAGE AND ADMINISTRATION: The Rituximab dose is 1000mg (1gm) given as a single I.V. infusion for 2 doses (days 1 and 15). No extra dosing will be given. Rituximab may be administered in an outpatient setting. Hypersensitivity reactions may occur. Premedication, consisting of acetaminophen (1gm) and diphenhydramine (50mg or equivalent dose) by mouth 30 to 60 minutes prior to the start of an infusion will be considered before each infusion of Rituximab. Rituximab will not be re-administered after initial dose regimen.